Extech Instruments 407445 User manual

INSTRUCTION MANUAL

Model 407445

Heavy Duty Hygro-Thermometer

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407445 Product Page

Specifications

General Specifications

Display Dual function LCD display with contrast adjustment

Measurement Relative Humidity (RH) and Temperature (°C & °F)

Data Hold Freezes Display

Sensor types Humidity: Thin film, capacitance sensor

Temperature: Thermistor

Memory Recall Records/Recalls MAX, MIN, and Average readings

Power off Automatic power off after approx 10 minutes of inactivity

Data Output RS 232 PC serial interface

Sampling Time Approximately 0.8 seconds

Operating

Temperature Instrument: 32 to 122°F (0 to 50 °C)

Probe: 32 to 140°F (0 to 60°C)

Operating Humidity < 90% RH

Power Supply 9V battery

Power Consumption Approx. 8.5 mA DC

Weight 0.76 lbs. (345 g) including batteries & probe

Size Instrument: 7.1 x 2.8 x 1.3" (180 x 72 x 32mm)

Sensor head: 1” diameter x 6.3” (26mm x 160mm)

Range Specifications

Range Resolution Accuracy

RH 10% to 95%

RH 0.1% RH >70% RH: ± 4% RH

< 70% RH: ± 3% RH

Temperature 32οF to 122οF

(0οC to 50οC) 0.1ο F/C ± 1.5 οF (± 0.8οC)

Congratulations on your purchase of Extech’s Heavy Duty Hygro-Thermometer. The Model

407445 displays Temperature & Relative Humidity simultaneously and includes a built-in

PC interface. This professional meter, with proper care, will provide years of safe reliable

service.

Introduction

Test Equipment Depot, 99 Washington Street, Melrose, MA 02176

781.665.1400 | 800.517.8431 | Fax: 781.665.0780

Page 3 Model 407445 Version 2.2 February 2004

Meter Description

1. Sensor input

2. RS-232 serial output jack

3. LCD Display

4. Keypad

5. Sensor

6. LCD contrast adjustment

7. Protective rubber jacket

8. Battery compartment and calibration pots on rear

Page 4 Model 407445 Version 2.2 February 2004

Meter Operation

Getting Started

1. Plug the sensor into the sensor jack at the top of the meter.

2. Press the Power OFF/ON key to turn the instrument on or off.

3. Select the temperature units by pressing the °C/°F key. The display will indicate "°C"

or "°F" as selected.

4. The meter will now display the per cent relative humidity and the temperature.

NOTE: For accurate relative humidity measurements the meter should be allowed

several minutes to adjust to ambient temperature changes.

Data Hold

Press the Data Hold key to freeze the displayed temperature and humidity readings. The

HOLD icon will appear on the display in the Data Hold mode. Press the Data Hold key

again to exit the Data Hold mode.

MAX, MIN, and AVG Record / Recall

1. Press the RECORD key to begin. The REC indicator will appear on the display and the

meter will begin tracking the highest (MAX), lowest (MIN), and average (AVG)

readings.

2. Press the RECALL key to display the highest (MAX) reading. The MAX indicator along

with the maximum reading recorded since RECORD was first pressed will appear.

3. Press the RECALL key again to view the lowest (MIN) reading.

4. Press the RECALL key again to view the average reading (AVG).

5. To exit, press the RECORD key.

Measurement Considerations

1. The meter includes an Auto Power OFF feature that turns the instrument off after

approximately 10 minutes of inactivity. To disable this feature, press the RECORD key

to enable the MIN/MAX/AVG function.

2. It may be necessary to adjust the display contrast due to a change in viewing angle or

voltage drift. Use the LCD contrast adjustment located on the right side of the meter.

Test Equipment Depot, 99 Washington Street, Melrose, MA 02176

781.665.1400 | 800.517.8431 | Fax: 781.665.0780

Page 5 Model 407445 Version 2.2 February 2004

RS-232 Serial PC Interface

This instrument includes a built-in RS-232 serial data port. This interface is intended for

use with the Extech Data Acquisition Software (PN 407001). For more information, contact

Extech or refer to the manual accompanying the 407001 software package.

Battery Replacement

1. The low battery indicator (LBT) appears on the left corner of the display when the

battery requires replacement. Reliable readings can be obtained for several hours after

the first appearance of the low battery indicator.

2. To replace the battery:

a) Remove the rubber jacket that encases the meter.

b) Open the rear battery compartment using a small coin or screwdriver.

c) Replace the 9V battery and re-assemble the meter.

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 407445 Product Page

Test Equipment Depot, 99 Washington Street, Melrose, MA 02176

781.665.1400 | 800.517.8431 | Fax: 781.665.0780

Page 6 Model 407445 Version 2.2 February 2004

Calibration

Humidity Calibration

Note: Calibration reference solutions are available from Extech (33%: Part No. 407453 and

75%: Part No. 407465).

1. The grid located on top of the sensor must be removed so that it may fit into the

calibration bottles.

2. Prior to calibrating, allow the meter and probe to stabilize to room temperature.

3. Open the battery compartment to access the calibration adjustments (see diagram

below).

4. Place the sensor head into the 33% calibration reference solution. Wait for a stable

reading (up to 30 minutes). Adjust VR3 until the display reads 33.0%.

5. Place the sensor head into the 75% calibration reference solution. Wait for a stable

reading (up to 30 minutes). Adjust VR4 until the display reads 75.0%.

Temperature Calibration

Note that the temperature calibration adjustments are rarely required. However if a

temperature calibration is in order, the user must have access to an environmental

chamber capable of providing 21oC and 50oC conditions. Allow time for the chamber and

the meter sensor to stabilize (30 minutes approx.) and then adjust the appropriate

potentiometer (see below):

•VR7 - Temperature 21oC adjustment

•VR6 - Temperature 50oC adjustment

Test Equipment Depot, 99 Washington Street, Melrose, MA 02176

781.665.1400 | 800.517.8431 | Fax: 781.665.0780

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